Well a set of nicson logs a risers just sold on ebay for about 100. If the mounts are in good shape they should go for about 150 ish.
on the long block it all depends on the heads, and internols... hell I have 1600 in just pistons and pins. the good thing about the 72 and up stuff is it has low compression. if you do end up buying the set up. ( if it has nicson logs and riser not gleenwood) I'll make you a deal on the logs and risers... just in case I ever want to switch back from the rewarder TT headers I am having built.